Exterior of a grille and grille insert for a truck



FIG. 1 is a right, front perspective view of an exterior of a grille and grille insert for a truck showing our new design, it may be understood that the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a right side view thereof and is a mirror image of a left side view;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof; and,

FIG 5 is a bottom view thereof. 

The ornamental design for an exterior of a grille and grille insert for a truck, as shown and described. 